Via Howard we learn that if the Supreme Court needs the Phillie Phanatic, Justice Breyer's chambers does the calling — and yes, the Phanatic will come:

  The Phillie Phanatic paid a visit to Phillies fanatic Samuel Alito during a recent Supreme Court party for its new justice.
  The Phanatic, and his best friend Tom Burgoyne, were called by Justice Stephen Breyer's office and were asked to surprise Alito at the party. There, Burgoyne says, the Phanatic gave Alito a hug and then high-fived the rest of the Supreme Court justices, who seemed into the lovable green goofball's antics.

Of course, the warm reception is what you would expect given what it takes to become a Supreme Court Justice.